Community Forums

barmcd · 02-02-2019, 10:36 AM

I installed an induction cook top in October and the inverter failed in November. I didn't think anything of it at the time as the inverter was 19 years old and the cook top seemed to be operating correctly. We don't boondock much so we rarely run on the inverter. This January we took a trip and ended up wanting to use the microwave and it wouldn't run but a few seconds before the inverter turned the 120 off. That's when I noticed this.

This is the remote display with no 120 VAC and the inverter turned off.

This is the display with it in inverting mode and nothing turned on in the coach.

I'm having a hard time believing the cook top is drawing 22 amps at all much less with the on/off switch turned off, but as soon as I unplug it, the output goes to 0 amps. The cook top still seemingly works fine.

i got to exploring and when I turn on the circuit breaker for the refrigerator, the output of the inverter immediately goes to 10 amps.

I'm beginning to wonder if I have an issue with the inverter. I installled the Magnum MS-2012 inverter and BMK battery monitor.

My next step is to go and buy a Kill O watt so I can see what the cook top and refrigerator are really drawing when on shore power so I can compare.

Old-Biscuit · 02-02-2019, 10:53 AM

What Induction Top do you have?

True Induction (what Winnebago uses) is a 2 burner -----1800W

1800W/120V AC=15A

docj · 02-02-2019, 11:24 AM

Quote:

Originally Posted by barmcd

I'm having a hard time believing the cook top is drawing 22 amps at all much less with the on/off switch turned off, but as soon as I unplug it, the output goes to 0 amps. The cook top still seemingly works fine.

i got to exploring and when I turn on the circuit breaker for the refrigerator, the output of the inverter immediately goes to 10 amps.

I'm beginning to wonder if I have an issue with the inverter. I installled the Magnum MS-2012 inverter and BMK battery monitor.

Don't forget that the inverter display is showing DC current at 12V not 120V AC! Since Power = volts x amps, 22 amps is only 264 watts which, in fact, is a pretty small power draw for a cooktop.

As for the microwave, your inverter is rated at 2kW and the load with the microwave and other things could be very close to that. I would guess that the inverter is kicking out either because it is overloaded or because the battery draw is so heavy that the voltage has dropped below the range needed for inverting.

rgl · 02-02-2019, 11:30 AM

Are those 12 volt amps or 120 volt amps?

1800 watts is a LOT to ask of your batteries and the inverter. Most say they can't/don't run their Sharp microwave (1600 watts) on the inverter even though it is wired to be plugged into it.

When you turn on the inverter, it has a fan, so some overhead. No TVs or other stuff plugged into inverter line?

twinboat · 02-02-2019, 11:37 AM

For some reason the cooktop is drawing 2.2 amps at 120 volts. ( 22 amps @12 = 2.2 amps @ 120).

You picture is also showing a pretty low voltage ( 12.4 ) for a 22 amp draw. It showing 12.5 volts with no load. Fully charged batteries should be at 12.6 or .7 volts.

Did you do this test after charging the batteries and how old are they ?

cavie · 02-02-2019, 11:40 AM

The 12 and 22 amp readings are 12 volt readings. That's what the inverter is drawing from the batteries. I don't understand the readings if the cook top is off

barmcd · 02-02-2019, 12:21 PM

Quote:

Originally Posted by Old-Biscuit

What Induction Top do you have?

True Induction (what Winnebago uses) is a 2 burner -----1800W

1800W/120V AC=15A

It's called a mini-duo and is mae by true induction.

barmcd · 02-02-2019, 12:23 PM

Quote:

Originally Posted by docj

Don't forget that the inverter display is showing DC current at 12V not 120V AC! Since Power = volts x amps, 22 amps is only 264 watts which, in fact, is a pretty small power draw for a cooktop.

As for the microwave, your inverter is rated at 2kW and the load with the microwave and other things could be very close to that. I would guess that the inverter is kicking out either because it is overloaded or because the battery draw is so heavy that the voltage has dropped below the range needed for inverting.

Ah, that make sense now. I got the Kill O Watt and the cook top is drawing 2.2 amps when it's turned off. I'm going to contact the manufacturer to find out if that is normal. It doesn't seem right.

barmcd · 02-02-2019, 12:25 PM

Quote:

Originally Posted by rgl

Are those 12 volt amps or 120 volt amps?

1800 watts is a LOT to ask of your batteries and the inverter. Most say they can't/don't run their Sharp microwave (1600 watts) on the inverter even though it is wired to be plugged into it.

When you turn on the inverter, it has a fan, so some overhead. No TVs or other stuff plugged into inverter line?

No, there were no other 120 volt loads at the time. Just the inverter itself, the parasitic draw from the cook top and the microwave.

barmcd · 02-02-2019, 12:26 PM

Quote:

Originally Posted by twinboat

For some reason the cooktop is drawing 2.2 amps at 120 volts. ( 22 amps @12 = 2.2 amps @ 120).

You picture is also showing a pretty low voltage ( 12.4 ) for a 22 amp draw. It showing 12.5 volts with no load. Fully charged batteries should be at 12.6 or .7 volts.

Did you do this test after charging the batteries and how old are they ?

Yeah, I got the Kill O Watt and it shows about 2.2 amps with the unit off. I had 12.8 volts when I started messing with the cook top and it came down to 12.5/6 by the time I took the pictures.

barmcd · 02-02-2019, 12:27 PM

Quote:

Originally Posted by cavie

The 12 and 22 amp readings are 12 volt readings. That's what the inverter is drawing from the batteries. I don't understand the readings if the cook top is off

Me either, I gotta call the manufacturer.

barmcd · 02-02-2019, 12:36 PM

I sent an email to True Induction asking about the current draw. They are closed today.

We won't be trying to use the micro without the generator from here on out.

jcussen · 02-02-2019, 01:20 PM

Just plugged my 1800 watt induction cooktop into a killowatt and when fan was running, drew 5 watts, with fan off nothing. If your fan is running, it might have a problem causing the high current draw.
My fan runs for a while after power button is turned off to cool down the internals.

C&SL · 02-02-2019, 02:06 PM

Quote:

Originally Posted by barmcd

I sent an email to True Induction asking about the current draw. They are closed today.

We won't be trying to use the micro without the generator from here on out.

Have you checked your voltage at the inverter when you have your mic or true induction running? Do you have a long cable run from the batteries to inverter? Mine has a large voltage drop when running large loads, I will be moving my inverter (Magnum MSH3012M) closer to the rear running box. It also used 2 amps more in stand by mode then my old Trex inverter (RV3012M) did. My parasitic draw is 9.8 amp normally.

C&SL
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